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AVprozaik [17]
3 years ago
13

Can someone who is good at math help me plssssss

Mathematics
1 answer:
pishuonlain [190]3 years ago
6 0

Answer:

angle DBC = 20 degrees

Step-by-step explanation:

We know that ABC is an isosceles triangle, therefore angle ACB = 80 as:

180 - 20 = 160

160/2 = 80

Now, the next few parts, you need to draw on paper to understand:

  • First, draw an isosceles triangle with the base of it on AD, and label the angles as (80, 80 and 20) on the right hand side. Also, label the top vertex of this triangle as X.
  • Then on the left hand side, draw an equilateral triangle with the base as AB, with the top vertex pointing to the top left, and label all the angles as  60 as it is equilateral. Also, label the top of this vertex as Y.
  • Now you should be able to see a large 5-sided shape with the vertexes of YAXDB.
  • We can label angle CDB as 80 because triangle BDC is an isosceles, therefore the bases are the same.
  • We can work out angle ADB as angles in a straight line add up to 180:  180 - 80 = 100.
  • Label angle ADB as 100
  • We can find the sum of the interior angles of a 5 sided shape with:          (n - 2) x 180 which if we input n = 5, we get 540.
  • Add up all the angles in the 5-sided shape, which will leave out ABD (from angle BYA clockwise):

60 + 60 + 20 + 80 + 20 + 80 + 100 + 60 = 480

  • Now we just need to work out what angle ABD is by subtracting 480 from the sum of interior angles (540) which gets: 60
  • From earlier on, we know angle ABC = 80 as the ABC triangle is isosceles, to work out what angle DBC is, we just need to do the final calculation:

80 - 60 = 20

and there's your final answer.

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Olaf earned $416.03 commission on his sales of $9245.00. What was his rate of commission?
Crank

Answer:

$1 per $22.22 sold.

Step-by-step explanation:

To find this answer, I divided his sales by his amount earned.

9245.00/416.03=22.22

This shows the for every 22.22 dollars sold, he recieved one dollar in commission.

Hope this helped! Thanks for posting your question! If correct, please award brainliest!

8 0
3 years ago
The national debt of a country is
olganol [36]

Answer:  3 \times 10^{13}

Explanation:

Highlight the first digit on the very left (2). The 7 right next to it means we'll round that 2 up to a 3. Every other digit becomes a zero.

The number 27,895,168,401,112 rounds to 30,000,000,000,000 which is the number 30 trillion.

It converts to the scientific notation 3 \times 10^{13} because we basically start with 3.0 and move the decimal point 13 spots to the right to arrive at 30 trillion as shown above.

8 0
3 years ago
<img src="https://tex.z-dn.net/?f=7%5Csqrt%7B3%7D%20%2B%5Csqrt%7B63" id="TexFormula1" title="7\sqrt{3} +\sqrt{63" alt="7\sqrt{3}
mezya [45]

Answer:7√3 + 3√7

Step-by-step explanation:

7√3 + √63

=> 7√3 + √(7×9)

=> 7√3 + (√7 × √9)

=> 7√3 + 3√7

8 0
3 years ago
Help me with this ASAP PLEASE!!!❤️
DaniilM [7]
The third one its already in order
7 0
3 years ago
On a coordinate plane, triangle L M N has points (1, negative 1), (3, 2), and (1, 3). An altitude is drawn from point M to point
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